(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-3\right)\left(x+1\right)$
$\left(x-2\right)\left(x+2\right)$
$\left(x-4\right)\left(-5+x\right)$
$\left(x+2\right)\left(2+x\right)$
$\left(-7+x\right)\left(x+2\right)$
$\left(2-x\right)\left(-x+3\right)$
$\left(-9+x\right)\left(-1+x\right)$
$\left(-4+x\right)\left(-1+x\right)$
$\left(3x+2\right)\left(9x+1\right)$
$\left(4x-3\right)\left(-6x+5\right)$
$\left(-2x+3\right)\left(-9+4x\right)$
$\left(5x-6\right)\left(2+5x\right)$
$\left(7+2x\right)\left(-8x+3\right)$
$\left(8+5x\right)\left(-2x+3\right)$
$\left(1+9x\right)\left(-4+5x\right)$
$\left(3+x\right)\left(8-x\right)$